Maybe people aren’t giving gifts because they are making or contributing to the sheva brochos. Food is very expensive these days….
I like to give gifts and I try to stock up on things on sale, like nice drinking glasses for the shabbos table, a picture frame, a nice naigel vaaser cup. and I write a nice note wishing them mazal tov and all the brochos!
If you can’t afford a gift I think your gift is attending the wedding which does cost you gas and your time.
May we only have more simchas in klal yisroel!